WesWorld

A little coastal minesweeper with basic ASW capability. Potentially looking at one per year indefinitely.

A-1, laid down 1941

Displacement:
500 t light; 517 t standard; 551 t normal; 578 t full load

Dimensions: Length overall / water x beam x draught
167.67 ft / 161.09 ft x 26.25 ft x 9.12 ft (normal load)
51.11 m / 49.10 m x 8.00 m x 2.78 m

Armament:
1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1941 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all amidships
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all aft
Weight of broadside 39 lbs / 18 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -
2nd: 0.59" / 15 mm - -
3rd: 0.59" / 15 mm - -

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 1,400 shp / 1,044 Kw = 15.57 kts
Range 4,000nm at 10.00 kts (Bunkerage = 62 tons)

Complement:
56 - 73

Cost:
£0.165 million / $0.662 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.9 %
Armour: 3 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 37 tons, 6.7 %
Hull, fittings & equipment: 371 tons, 67.4 %
Fuel, ammunition & stores: 51 tons, 9.3 %
Miscellaneous weights: 84 tons, 15.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,610 lbs / 730 Kg = 45.6 x 4.1 " / 105 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.500
Length to Beam Ratio: 6.14 : 1
'Natural speed' for length: 12.69 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.70 ft / 5.70 m
- Forecastle (20 %): 15.75 ft / 4.80 m
- Mid (50 %): 15.75 ft / 4.80 m (7.87 ft / 2.40 m aft of break)
- Quarterdeck (15 %): 7.87 ft / 2.40 m
- Stern: 7.87 ft / 2.40 m
- Average freeboard: 12.05 ft / 3.67 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 46.9 %
- Above water (accommodation/working, high = better): 110.3 %
Waterplane Area: 2,817 Square feet or 262 Square metres
Displacement factor (Displacement / loading): 276 %
Structure weight / hull surface area: 65 lbs/sq ft or 318 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.58
- Longitudinal: 14.59
- Overall: 1.97
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

...and a little submarine chaser/patrol craft. Hull strength's high, but that's because I can't stick much misc. weight or crank the speed higher without doing bad things to the seakeeping and stability.

We're contemplating two per year for a while. Uses up a Type 0 slip and loose change in materials.

S-7, laid down 1941

Displacement:
218 t light; 225 t standard; 262 t normal; 292 t full load

Dimensions: Length overall / water x beam x draught
126.58 ft / 123.03 ft x 19.69 ft x 6.89 ft (normal load)
38.58 m / 37.50 m x 6.00 m x 2.10 m

Armament:
2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1941 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 800

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 1,200 shp / 895 Kw = 16.15 kts
Range 2,000nm at 15.00 kts (Bunkerage = 67 tons)

Complement:
32 - 42

Cost:
£0.077 million / $0.308 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.2 %
Armour: 1 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 32 tons, 12.1 %
Hull, fittings & equipment: 166 tons, 63.1 %
Fuel, ammunition & stores: 44 tons, 16.9 %
Miscellaneous weights: 19 tons, 7.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
754 lbs / 342 Kg = 487.6 x 1.5 " / 37 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 0.5 ft / 0.1 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.52

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 6.25 : 1
'Natural speed' for length: 11.09 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 33
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10.83 ft / 3.30 m
- Forecastle (20 %): 9.84 ft / 3.00 m
- Mid (50 %): 9.84 ft / 3.00 m
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 9.92 ft / 3.02 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 50.3 %
- Above water (accommodation/working, high = better): 99.0 %
Waterplane Area: 1,690 Square feet or 157 Square metres
Displacement factor (Displacement / loading): 301 %
Structure weight / hull surface area: 45 lbs/sq ft or 222 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.42
- Longitudinal: 16.99
- Overall: 1.83
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Armament on the subchaser seems abit on the week side, perhaps a 3" DP gun?

The minesweeper looks like a nice little ship. Looks like something useful and good to keep Peru's shipbuilding industry ticking over. It's fairly similar to a recent Italian type but the Italian ship is faster to act as a patrol vessel.

I think geared drive is likely necessary rather than direct, unless you want the propeller to be doing 1000rpm+. A single engine-single shaft arrangement is likely cheaper and simpler as well.

Quoted

Originally posted by Red Admiral
I think geared drive is likely necessary rather than direct, unless you want the propeller to be doing 1000rpm+. A single engine-single shaft arrangement is likely cheaper and simpler as well.

I think I'd agree with that.

That's easy enough to change. So far as I know it has no impact on the sim numbers.

Quoted

Originally posted by The Rock Doctor
That's easy enough to change. So far as I know it has no impact on the sim numbers.

Usually no, I have seen times where ADDING shafts can lower the overall, but never seen it hurt the ship by removing them.

A little LCI, to be built at a rate of two per year. It'll give Peru some basic coastal transporation capability, and allow an invasion of Colombia in a century or so.

LCI, laid down 1941

Displacement:
269 t light; 276 t standard; 302 t normal; 323 t full load

Dimensions: Length overall / water x beam x draught
143.97 ft / 127.95 ft x 26.25 ft x 5.25 ft (normal load)
43.88 m / 39.00 m x 8.00 m x 1.60 m

Armament:
3 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread
Aft Main mounts separated by engine room
Weight of broadside 1 lbs / 0 kg
Shells per gun, main battery: 2,000

Armour:
- Conning tower: 0.59" / 15 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,100 shp / 820 Kw = 15.22 kts
Range 4,000nm at 10.00 kts (Bunkerage = 48 tons)

Complement:
36 - 47

Cost:
£0.084 million / $0.335 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 1 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.2 %
Machinery: 29 tons, 9.6 %
Hull, fittings & equipment: 136 tons, 45.0 %
Fuel, ammunition & stores: 33 tons, 11.0 %
Miscellaneous weights: 103 tons, 34.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
927 lbs / 420 Kg = 3,796.8 x 0.8 " / 20 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.8 ft / 0.3 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 4.88 : 1
'Natural speed' for length: 11.31 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 13.12 ft / 4.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (20 %): 13.12 ft / 4.00 m
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (15 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 13.39 ft / 4.08 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 69.6 %
- Above water (accommodation/working, high = better): 170.6 %
Waterplane Area: 2,456 Square feet or 228 Square metres
Displacement factor (Displacement / loading): 186 %
Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.74
- Longitudinal: 15.48
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

An interesting design, with interesting implications.

Of course, coastal traffic is important to the Peruvian economy, and engaging the Navy in nation-building activities will mute the calls for economy at all cost.